It’s not clear where these images come from, or whether the battery is made indeed for the iPhone 6, but the publication points out a series of numbers printed on the battery (741-0115), which are also found on the iPhone 5s’s battery, and speculates this particular battery may be made for the bigger iPhone 6 model, also known as the iPhone Air.

Apparently, the images were taken at an iPhone supplier, although other details about them are not available. The usual markings that are printed on an iPhone battery were not present on this unusual battery, so it’s not clear what capacity the battery has.